Nut-lock.



J. C. ROBINSON & J. ANDREWS. NUT LOCK.

APPLICATION FILED NOV. 20, 1914.

1 1% KEG? Patented May 25, 1915.

. JAMES C. ROBINSON AND JASPER ANDREWS, 0F DENVER, COLORADO.

NUT-LOOK.

meteor.

Specification of Letters Patent.

Patented May 25, 1915.

Application filed November 20, 1914. Serial No. 873,176.

To all whom it may concern Be it known that we, JAMES C. RoBINsoN and JASPER ANDREws, citizens of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Nut-Locks; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to new and useful improvements in nut and bolt locks and has for its primary object to generally improve and simplify the construction and operation of such devices so as to render them more practical, reliable and efficient in operation and inexpensive to manufacture.

Another and more specific object is to provide a nut lock in which the locking element may be easily unlocked without necessitating the employment of special tools or resulting in the injury to the locking member.

Another object is to provide locking means that will automatically lock the nut in any desired position upon the bolt.

The above and additional objects are accomplished by such means as are illustrated in the accompanying drawings, described in the following specification and then more particularly pointed out in the claims.

With reference to the drawings, wherein we have illustrated the preferred embodiment of our invention as it is reduced to practice, and throughout the several views of which similar reference numerals designate corresponding parts, Figure 1 is a side elevation of our improved nut lock, Fig. 2 is a cross sectional view taken on line 2-2 of Fig. 1 showing in detail the lock, Fig. 3 is a sectional view taken at right angles to the view in Fig. 2, and Fig. 4 is an enlarged detail rear elevation of the locking member.

Referring to the drawings by characters of reference, 1 designates as an entirety a bolt that is provided with a screw threaded end 2 and 3 designates a polygonal nut turned upon the screw threaded end 2 of the bolt. The screw threaded end 2 is formed with a plurality of closely associated parallel grooves 4 that extend longitudinally of the bolt and form in combination with the grooves of the screw threads, a plurality of closely associated projections 5. The nut 3 is formed interiorly with an approximately rectangular recess 6 which opens upon the screw threads of the nut and communicates with the outer adjacent side face of the nut by means of a small screw threaded opening which is adapted to receive a key to unlock the locking mechanism as will be later more fully described.

A segmental locking block 8 having a curved threaded outer face and a recessed inner face is mounted within the recess 6 so that its curved threaded face is concentric with the threaded bore of the nut. The locking block 8 is of less length than the length of the recess so that considerable space between one end of the block and the adjacent side of the recess is provided. Pivoted within the recessed inner face of the block 8 by means of a suitable pivot pin 9 is a spring pressed locking pawl 10 of substantially L-shape, one end of the pawl be ing disposed for engagement with the proj ections 5 formed on the bolt and being extended between one end of the block and adjacent the side wall of the recess 6 for such engagement. The other end of the pawl 1.0 is arranged within the rear part of the recess 6 and a small expansion spring 11 is interposed between said last named end and the block 8, a recess 12 being provided in the block 8 to receive one end of the spring 11. The spring 11 normally holds the outer end of the pawl 10 in cooperative position with the bolt. The bolt engaging end of the pawl 10 is so arranged as to yieldingly engage the projections '5 on the bolt upon clockwise turning of the nut upon the bolt and to lock with the projections upon counter-clockwise movement of the nut. The end of the block 8 adjacent to the bolt engaging end of the pawl 10 is bifurcated to receive said bolt engaging portion of the pawl. A small screw 13 is turned within the openings 7 and forced into engagement with the adjacent end of the pawl 10 so as to move the opposite end of the pawl out of engagement with the bolt projections and thus unlock the locking device.

With reference to the foregoing description and accompanying drawings, it will be observed that we have provided a nut lock which will automatically lock itself in any desired position relative to the bolt and that may be easily unlocked without necessitath ing the employment of special tools or resulting in injury to the locking device.

In panic-e we Have found that the form of our invention, illustrated in the drawings and referred to in the 1 above description; as

thepreferred embodiment, is the most efiicient and practical; yet realizing that the" conditions concurrent with the adoption of ing any: of the'advant-agesof our invention,

as set forth in'the appended claims.

What isclaime'd is :5

In a; nut lock, theicombination with .a bolt having" a threaded end formed'with a plurality of longitudinal grooves forming projections;- of a nut; a recess formed in the'nut, a locking block mounted within the recess and having a curved threaded outer face to'engage the bolaa pawl pivoted upon said lock having one end extended outwardly from the recess to engage the projections on said bolt and yieldingly engaging the projections upon rotation of the nut in one direction and spring means mounted within the recessto hold the pawl in operative position:

, 2i Ina; nut look, the combination with a bolt having one end threaded and formed throughout the entire threaded surface-with a plurality of closely associated projections,

Copies of this latent may be obtained for fiive cents each, by; addressing the Commissioner of iatents,

of a? nut' having a recess adjacent the bore thereof, a block mounted within said recess and ha'ving a threadedouter face to engage said bolt, said block being loose within said recess and being recessed upon its inner face and atone end, a pawl pivoted withinthe recess in said block and having one end extendedforengagement with said projec tions, means whereby the pawl may be moved out of lockingposition and spring means-to normally hold the pawl in locking position. i V

In a nut lock, the combination with a bolt having one end threaded and formed with projections of; a nut having a recess in the innerface thereof mounted on said threaded end of the bolt, a block loosely mounted Withinsaid recess and having a threaded outer face to engage said bolt, a pawl carried" by said block and arranged for engagement with the projections to lock the nut, means tonormally hold the pawl inlocking position and means whereby the pawl maybe moved out of locking position.

In testimony whereof we affix our signatu'r'es inpresence of two witnesses.

JAMESG. ROBINSON. J ASPER ANDREWS.

Witnesses: H

K. ANDREWS,

DULEY.

Washington, D. 0. 

